Are you using any lubricant? I'm using dishwash soap water and seems to work fine.
I got it on the the rim by using brute force

also I have a beadbuddy that helps so you don't have to use your other hand to keep the bead from rising o the opposite side. Also make sure that you push the bead that you have gotten over in the middle of the rim, that helps to get more slack as it goes more in to the rim..
Hope you get what I mean
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